Environment
- Pythonnet version: 3.0.0.dev1
- Python version: 3.9.9
- Operating System: Kali Linux
- .NET Runtime:
mono-complete:amd64/kali-rolling 6.8.0.105+dfsg-3.2 uptodate
mono-devel:all/kali-rolling 6.8.0.105+dfsg-3.2
Details
This example causes segfault before python shutdown:
import clr
from System import IntPtr
a = clr.GetClrType(IntPtr)
Actually no matter what type is imported (IntPtr, Console, etc.) - crashing anyway. However, crash happen exactly after the program finished its executing and only when NO debugging.
gef➤ bt
#0 0x0000000040071c50 in ?? ()
#1 0x0000000000508a13 in _Py_Dealloc (op=<optimized out>) at ../Objects/object.c:2209
#2 _Py_DECREF (op=<optimized out>) at ../Include/object.h:430
#3 _Py_XDECREF (op=<optimized out>) at ../Include/object.h:497
#4 free_keys_object (keys=0x11ac070) at ../Objects/dictobject.c:598
#5 0x0000000000508824 in dictkeys_decref (dk=<optimized out>) at ../Objects/dictobject.c:333
#6 dict_dealloc (mp=0x7ffff78671c0) at ../Objects/dictobject.c:2026
#7 0x00000000005a9f60 in _Py_DECREF (op=<optimized out>) at ../Include/object.h:430
#8 _Py_XDECREF (op=<optimized out>) at ../Include/object.h:497
#9 module_dealloc (m=0x7ffff7863cc0) at ../Objects/moduleobject.c:677
#10 0x00000000004f9749 in _Py_Dealloc (op=<optimized out>) at ../Objects/object.c:2209
#11 _Py_DECREF (op=<optimized out>) at ../Include/object.h:430
#12 _Py_XDECREF (op=<optimized out>) at ../Include/object.h:497
#13 insertdict (mp=<optimized out>, key='__main__', hash=<optimized out>, value=<optimized out>) at ../Objects/dictobject.c:1123
#14 0x00000000006294a0 in _PyImport_Cleanup (tstate=0x94e6e0) at ../Python/import.c:526
#15 0x000000000062732f in Py_FinalizeEx () at ../Python/pylifecycle.c:1426
#16 0x000000000061e0c0 in Py_RunMain () at ../Modules/main.c:679
#17 0x0000000000606199 in Py_BytesMain (argc=<optimized out>, argv=<optimized out>) at ../Modules/main.c:731
#18 0x00007ffff7c427ed in __libc_start_main (main=0x606160 <main>, argc=0x2, argv=0x7fffffffde18, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffde08) at ../csu/libc-start.c:332
#19 0x000000000060609a in _start ()
gef➤ xinfo 0x0000000040071c50
[*] Cannot reach 0x40071c50 in memory space
gef➤ xinfo 0x0000000000508a13
Page: 0x000000000041f000 → 0x0000000000690000 (size=0x271000)
Permissions: r-x
Pathname: /usr/bin/python3.9
Offset (from page): 0xe9a13
Inode: 6816263
Segment: .text (0x0000000000420e70-0x000000000068fe11)
Offset (from segment): 0xe7ba3
Symbol: free_keys_object.lto_priv+115
If we add at the end of the script this line, then everything works like a charm:
Also works well if we clear variable at the end:
Environment
mono-complete:amd64/kali-rolling 6.8.0.105+dfsg-3.2 uptodate
mono-devel:all/kali-rolling 6.8.0.105+dfsg-3.2
Details
This example causes segfault before python shutdown:
Actually no matter what type is imported (IntPtr, Console, etc.) - crashing anyway. However, crash happen exactly after the program finished its executing and only when NO debugging.
If we add at the end of the script this line, then everything works like a charm:
Also works well if we clear variable at the end: